W's Siren 4 Thermo Mid Zip Waterproof tools-equipment Excellent weight-to-performance ratio: standard-sized

Excellent weight-to-performance ratio: standard-sized

Lacing system : Regular laces

Your new go-to

A new season calls for new gear to play your favorite sports—or just getting outside for fun

acid and organic fat resistant

W's Siren 4 Thermo Mid Zip Waterproof tools-equipment Excellent weight-to-performance ratio: standard-sizedWith 25 years of Merrell's women's specific fit, the Siren 4 Thermo is uniquely engineered to cradle the distinct contours of female feet, providing comfort, support, and stability even on the longest hikes with 200 grams of added insulation for warmth and protection. Now equipped with SOLARCORE insulation, lightweight insulation material initially designed for NASA, you never have to worry about warmth. The all new medial zipper provides easy on off,